<span>前端安装包上传</span>
<br>
<nz-upload [(nzFileList)]="fileList" [nzBeforeUpload]="beforeUpload">
  <button nz-button>
    <span nz-icon nzType="upload"></span>
    请选择文件
  </button>
</nz-upload>
<br>
<button nz-button nzType="primary" nzSize="small" (click)="uploadFile()">上传</button>

